Receiving arrangement for wireless telegraphy



May 8, 1923. f I 1,454,328

A. MEISSNER RECEIVING ARRANGEMENT FOR WIRELESS TELEGRAPHY Filed Sept. 5, 1921 mum Patented May 8, 1923.

ALEXANDER MEISSNER, OF BERLIN, GERMANY.

RECEIVING ARRANGEMENT FOR WIRELESS TELEGRAPHY.

Application filed September 3, 1921.

Serial No. 498,415.

(GRAN TED UNDER THE PROVISIONS OF THE ACT OF MARCH 3, 1921, 41 STAT. L., 1313.)

To all whom it may concern:

Be it known that I, ALEXANDER Mnrss- NEH, citizen of the German Republic, residing at Berlin, Germany, have invented certain new and useful Improvements in Receiving Arrangements for IVireless Telegraphy (for which I have filed an application 'in Germany, April 22, 1914, Patent No. 334,675), of which the following is a specification.

The object of the present invention is an improvement on the wireless telegraph receiving arrangements disclosed in German Patent 332,581.

In accordance with the main patent, a cathode relay is actuated by means of an alternating current generator at the receiving station, whereby the received high frequency energy is at the same time transformed and amplified. The changes in the intensity of this alternating current may then be observed by well known means, such as an ordinary telephone. The sound of the local alternating current source may then be heard corresponding to the signal received.

In accordance with the present invention, a particularly advantageous arrangement; consists in that the cathode relay is a tube haying two anodes and two amplifying gr1ds, whereb one grid is operated by the incoming higli frequency, and the other by the alternating current.

The drawing represents an exemplification of such an arrangement.

1 is a cathode relay having two anodes 2, 3 and two auxiliary anodes (amplifying grids) 4 and 5. 6 is a glowing cathode, winch is heated by the battery 7. '8 is a battery provided between anode 2 and cathode 6, whereas the battery 9 is provided between cathode 6 and anode 3. Preferably, the voltage of battery 9 is higher than that of battery 8. By means of coil 10 connected with coil 11 and antenna 12, the received high frequency oscillations may be conducted to the tube 1, whereby the resistance for path 6, 5, 3, will be increased. The electrons flowing towards anode 3 are partially reflected and find a lower resistance in the path 6, 1, 2. At 4,, these electrons or ions are affected by the local alternating current of audible frequency which flows from machine 14 through transformer 13, and the amplification is effected in the well known manner. In view of the fact that all vibrations result in a flow of electrons, the received signals may be heard in telephone 15, and have always the tone of the auxiliary frequency of the machine 14. Obviously, it is not necessary directly to connect the telephone 15, with the line, but the connection may be effected also through a transformer.

The continuous tone provided by machine 14, which under certain circumstances may interfere with the intelligibility of the signals, may be eliminated by means of well known compensating connections.

I claim:

1. In a radio receiving circuit, a source of audio frequency alternating current, a thermionic tube having two anodes and two grids, means for impressing received oscillations on one of the grids. and means for impressing audio frequency oscillations on the other grid.

The method of operating a radio receiving circuit comprising a thermionic tube lavlng two anodes and two grids, which comprises impressing on one grid the high frequency received oscillations, and impressing on the other grid audio frequency oscillations.

In testimony whereof I aflix my signature. 85

ALEXANDER MEISSNER. 

